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Dalhousie research study seeking people ...

Description: Dalhousie University is currently seeking individuals to participate in a study titled “A Study on Personality and Drinking.” There are no limitations to who may participate in the study. You are invited to participate in a research study conducted by Dr. Sean Mackinnon from the Department of Psychology at Dalhousie University. This study has been reviewed by the Dalhousie Social Sciences and Humanities Research Ethics Board (ethics approval #2016-3995). You will be asked to fill out 3 questionnaires online. Each person who completes the questionnaires will...
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Information

Earn up to 3.0 credits and a $12 Amazon gift card for participating in research about personality and drinking! To participate in this study, you must: (a) be between the ages of 18 and 25; (b) you must have had at least 12 alcoholic drinks in the past year; and (c) you must have access to the Internet at home. Email person@dal.ca to...
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Generalized Linear Models for Between Su...

There aren’t many good, easy-to-understand resources on Generalized Linear Models. This is a shame, because they are usually a substantial improvement over more conventional ANOVA analyses, because they can much better account for violations of the normality assumption. Check out some tutorial slides I created here: They only cover between-subjects designs. Maybe some time I’ll also make one for generalized mixed models, which take the best of GLiM and multilevel models and combine them into...
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Simple Validity Statistics for Teachers

My primary area of interest (besides statistics) is personality psychology. If there’s one thing you’ll notice about personality psychologists, it’s that we’re kind of obsessed with questionnaire measurement – and usually rely on some pretty complicated statistics to really be satisfied that a questionnaire is suitable for our purposes. Really though, we’re usually interested in two things: Are the questionnaires reliable? That is, does the questionnaire produce consistent results under similar conditions? Are the measurements valid? That is, does the questionnaire...
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Basics of SEM Tutorial

Attached are some slides that I’ve used to teach my PSYO 6003 Multivariate Statistics students the basics of structural equation modelling, which may be of some use to people using it for the first time. Check them out here:
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Multicolinearity: Why you should care an...

Multicolinearity: Why you should care and what to do about it Multicolinearity is a problem for statistical analyses. This large, unwieldy word essentially refers to situations where your predictor variables so highly correlated with one another, they become redundant. Generally speaking, this is a problem because it will increase your Type II error rate (i.e., false negatives). In the most severe cases, multicolinearity can produce really bizarre results that defy logic. For example, the direction of relationships can sometimes reverse (e.g., a positive relationship...
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Growth Curves Tutorial

In 2013, I was invited by the IWK to give a short workshop on growth curves using SPSS software. I’ve since published the slides online using SlideShare for anyone to use as materials for learning or teaching. Check them out here:
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Single Imputation using the Expectation-Maximization Algorithm

Single Imputation using the Expectation-...

In this post, I outline when and how to use single imputation using an expectation-maximization algorithm in SPSS to deal with missing data. I start with a step-by-step tutorial on how to do this in SPSS, and finish with a discussion of some of the finer points of doing this analysis. 1. Open the data-file you want to work with. 2. Sort the data file by ascending ID or Participant number. This is critical; if you do not do this, everything you do subsequently could be inaccurate. To do this, right click on the ID column, and click “sort ascending” 3. Open the Syntax...